Bosch Electronic Highflow 21e

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About Bosch Highflow 21e

If you’re after a top quality hot water heater suitable for a 1-2 bathroom home then you should consider a Bosch Electronic Highflow 21e gas continuous flow hot water heater.

We can supply, install, repair or service your hot water heater, covering all brands, including the Bosch Electronic Highflow 21e.

Bosch hot water system
Bosch Electronic Highflow 21e

This compact hot water heater is designed for external installation only, but can easily be installed into a covered or non-covered recess box to allow for even more space-savings and to help to protect your appliance from the harsh Australian weather conditions.

At Jim’s Plumbing we are the experts when it comes to hot water heaters.

Read on if you’d like to know more in regards to if the Bosch 21e Highflow hot water unit is right for your property.

Or call one of our trusted plumbers for advice on the best hot water system to suit your home or business that will adequately meet your hot water heating demands.

The hot water expert plumbers from Jim’s are available 24/7 across all metropolitan areas of Adelaide, Melbourne, Perth, Brisbane, Sydney and Canberra.

In a hot water emergency we can be knocking on your door within an hour* of your call.

What are the advantages of the Bosch Highflow 21e?

When it comes to hot water heating technology Bosch is in the forefront of leading hot water heating manufacturers with over 127 years of experience. When you choose a Bosch hot water heater you are choosing quality, durability and reliability which is proven by the generous warranties given on their hot water units.

The Bosch Highflow 21e’s continuous flow technology is extremely economical with a 6.3 star energy efficiency rating and antifrost included.

The compact unit is designed to operate on either natural gas or LPG and comes with up to 4 optional convenient water temperature controllers, which make for an ideal safety feature.

No Interest Ever!* Payment Plan Options Available

No Interest Ever!* payment plan options available on hot water heater replacements to help ease any financial stress this burden may cause. If your bosch hot water heater is leaking, or you have no hot water, we can often have a plumber to you within the hour*.

Is the Bosch Highflow 21e right for me?

When considering purchasing a new hot water heater you need to take many factors into play to ensure you get the right system to suit your property and your hot water requirements.

You need to look at the size of your property, how many residents along with how you all use your hot water e.g. how many showers in a day, do you use the bath, how often you wash the dishes or if you use a dishwasher and if you wash clothes using hot water etc. to ensure the unit you choose has the capacity to suit.

You also need to know which fuel sources would be the best option for your home or office – do you have access to natural gas, can you install solar panels on your roof facing the right direction? etc.

As you can see there is so much to consider rather than just the price of a hot water system.

Choosing a system based solely on price is never recommended as you may end up paying more going forward on your energy bills, or end up with more cold showers than you’d bargained for!

If you want to take the hassle out of your research call Jim’s Plumbing.

We’ll send a fully qualified and insured hot water heater specialist to your location to provide you with a no obligation quote to supply and install the ideal hot water heater for you.

If a hot water heater was the last thing you’d budgeted for then just take advantage of our no interest EVER payment plans* and jump back into that steamy hot shower before you know it!

If you like the sound of the Bosch Highflow 21e below are the specifications

Bosch Highflow 21e Specifications
Part No. YS2180RAH
External/Internal Installation External Installation only
Ignition type Electric
Litres per minute (25°C rise) 21
Suited to no. of bathrooms 1-2
Minimum operating water inlet pressure 100 kPa
Minimum constant water pressure for Maximum flow 103 kPa
Maximum water inlet pressure 1000 kPa
Mj/Hour 170
Energy Efficiency Star Rating 6.30 Stars
Antifrost included Comes standard with unit
Solar Transfer Valve No
50°C Limited Part No. YS2170RA5*
Applicable Gas Type Natural Gas / LPG
Electrical Supply Required 230 VAC – 240V 50 Hz (weatherproof power point of 10amp within 500 mm of the hot water system)
Optional Hot Water Temperature Controllers Maximum of 4 temperature controllers
Unit Height 520 mm
Unit Width 350 mm
Unit Depth 170 mm
Box Weight 19 Kg
Parts and Labour only 3 Years
Heat Exchanger 10 Years (part only)
Size of Pipe Connection  
Natural gas (mm) 20 (3/4”)
LPG (mm) 20 (3/4”)
Cold Water (mm) 20 (3/4”)
Hot Water (mm) 20 (3/4”)

Choosing the Correct Hot Water System

Choosing the correct hot water system can be difficult, as there are so many options to choose from; Click on the links to find out more about these systems.




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Please be advised that we may have additional Bosch Hot Water System models available.

Simply book a plumber online now, or phone 1300 133 509 to book now.

*NO INTEREST EVER!* PAYMENT PLAN, “Fees, terms and conditions apply”.

No Interest Ever!* Payment Plan offered through Certegy Ezi-Pay Express. No Interest Ever on your hot water heater replacement or new supply and installation, gas service, water service or drain replacement. Conditions apply.

Information on this page is subject to change. Commercial hot water systems also available on enquiry.

*Conditions apply.